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Re: [EnergyPlus_Support] Calculated Design Load = 0 ?





Francesco,


On Thu, May 11, 2017 at 5:04 AM, fpasserini.tn@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@yahoogroups.com> wrote:
 

Hello, as for the â??Zone Sensible Heatingâ?? for the highlighted zone the â??Calculated Design Load [W]â?? is equal to 0 although the â??Thermostat Setpoint Temperature at Peak Loadâ?? (24°C) is not met (I have attached an image where you can see part of the html report). The zone is served by a VAV system that supplies many zones. There is a local reheat coil, whose power is autosized equal to 0 and therefore the zone setpoint temperature is not met.

What I consider really strange is that other zones are served by the same VAV system and have the same parameters for Sizing:zone but their â??Calculated Design Load [W]â?? is greater than 0 (e.g. 00:SPOGLIATOIOFEMMINILE).

 

Sizing:Zone,

    00:SpogliatoioMaschile,  !- Zone or ZoneList Name

    TemperatureDifference,   !- Zone Cooling Design Supply Air Temperature Input Method

    12.22,                   !- Zone Cooling Design Supply Air Temperature {C}

    11.11,                   !- Zone Cooling Design Supply Air Temperature Difference {deltaC}

    TemperatureDifference,   !- Zone Heating Design Supply Air Temperature Input Method

    35,                      !- Zone Heating Design Supply Air Temperature {C}

    11.11,                   !- Zone Heating Design Supply Air Temperature Difference {deltaC}

    0.0090,                  !- Zone Cooling Design Supply Air Humidity Ratio {kgWater/kgDryAir}

    0.0040,                  !- Zone Heating Design Supply Air Humidity Ratio {kgWater/kgDryAir}

    00:SpogliatoioMaschile Design Specification Outdoor Air Object,  !- Design Specification Outdoor Air Object Name

    1.25,                    !- Zone Heating Sizing Factor

    1.15,                    !- Zone Cooling Sizing Factor

    DesignDay,               !- Cooling Design Air Flow Method

    0.000000,                !- Cooling Design Air Flow Rate {m3/s}

    0.000760,                !- Cooling Minimum Air Flow per Zone Floor Area {m3/s-m2}

    0.000000,                !- Cooling Minimum Air Flow {m3/s}

    0.00,                    !- Cooling Minimum Air Flow Fraction

    DesignDay,               !- Heating Design Air Flow Method

    0.000000,                !- Heating Design Air Flow Rate {m3/s}

    0.002030,                !- Heating Maximum Air Flow per Zone Floor Area {m3/s-m2}

    0.141580,                !- Heating Maximum Air Flow {m3/s}

    0.30,                    !- Heating Maximum Air Flow Fraction

    00:SpogliatoioMaschile Design Specification Zone Air Distribution Object;  !- Design Specification Zone Air Distribution Object Name

 

DesignSpecification:OutdoorAir,

    00:SpogliatoioMaschile Design Specification Outdoor Air Object,  !- Name

    Flow/Zone,               !- Outdoor Air Method

    ,                        !- Outdoor Air Flow per Person {m3/s-person}

    0.000000,                !- Outdoor Air Flow per Zone Floor Area {m3/s-m2}

    0.44,                    !- Outdoor Air Flow per Zone {m3/s}

    0.000000,                !- Outdoor Air Flow Air Changes per Hour {1/hr}

    occupazione;             !- Outdoor Air Schedule Name

 

Best Regards

Francesco





--

James V Dirkes II, PE, BEMP, LEED AP
CEO/President
The Building Performance Team Inc.
1631 Acacia Dr, GR, Mi 49504

Direct / Mobile: 616.450.8653
jim@buildingperformanceteam.com

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Posted by: Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>


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